:root, [data-theme="light"] {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem; --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem; --space-12: 3rem; --space-16: 4rem;
  
  --color-bg: #f4f6f8;
  --color-surface: rgba(255, 255, 255, 0.85);
  --color-surface-2: #ffffff;
  --color-surface-offset: #eef2f5;
  --color-border: #dfe3e8;
  --color-divider: #f0f2f5;
  
  --color-text: #1c2433;
  --color-text-muted: #5c6c7f;
  --color-text-faint: #919eab;
  --color-text-inverse: #ffffff;
  
  --color-primary: #006ce6;
  --color-primary-hover: #0050ab;
  --color-primary-highlight: #e0f2fe;
  --color-warning: #b76e00;
  --color-success: #118d57;
  --color-error: #b71d18;
  
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 16px 40px rgba(0,0,0,0.08);
  
  --mobile-accent: #0288d1;
  --mobile-accent-2: #e1f5fe;
  
  --font-display: 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --backdrop-blur: blur(12px);
}

[data-theme="dark"] {
  --color-bg: #0b0f19;
  --color-surface: rgba(22, 28, 36, 0.75);
  --color-surface-2: #212b36;
  --color-surface-offset: #161c24;
  --color-border: #354253;
  --color-divider: #263240;
  
  --color-text: #f4f6f8;
  --color-text-muted: #919eab;
  --color-text-faint: #637381;
  --color-text-inverse: #ffffff;
  
  --color-primary: #339dff;
  --color-primary-hover: #76baff;
  --color-primary-highlight: #0d2845;
  --color-warning: #ffab00;
  --color-success: #22c55e;
  --color-error: #ff5630;
  
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg: 0 16px 40px rgba(0,0,0,0.6);
  
  --mobile-accent: #38bdf8;
  --mobile-accent-2: #0c2b3e;
}

*, :before, :after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: none; text-size-adjust: none; scroll-behavior: smooth; }
body { 
  min-height: 100dvh; 
  line-height: 1.6; 
  font-family: var(--font-body); 
  font-size: var(--text-base); 
  background: 
    radial-gradient(circle at 10% 20%, color-mix(in srgb, var(--color-primary) 15%, transparent), transparent 40%),
    radial-gradient(circle at 90% 80%, color-mix(in srgb, var(--mobile-accent) 15%, transparent), transparent 40%),
    var(--color-bg); 
  background-attachment: fixed;
  color: var(--color-text); 
  transition: background 0.3s ease, color 0.3s ease;
}

img, svg { display: block; max-width: 100%; height: auto; }
button, input, textarea, select { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; }

:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }

.shell { max-width: 1200px; margin: 0 auto; padding: var(--space-4); }

.hero { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: var(--space-8); padding-block: clamp(var(--space-6), 6vw, var(--space-12)); align-items: start; }
.brand { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-8); }
.brand svg { width: 48px; height: 48px; color: var(--color-primary); filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1)); }
.brand-name { font-size: var(--text-lg); font-weight: 800; letter-spacing: -0.02em; }

/* Glassmorphism Cards */
.hero-card, .panel, .result-card, .note, .step-card { 
  background: var(--color-surface); 
  backdrop-filter: var(--backdrop-blur); 
  -webkit-backdrop-filter: var(--backdrop-blur);
  border: 1px solid rgba(255, 255, 255, 0.1); 
  border-radius: var(--radius-xl); 
  box-shadow: var(--shadow-md); 
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
[data-theme="dark"] .hero-card, [data-theme="dark"] .panel, [data-theme="dark"] .result-card, [data-theme="dark"] .note, [data-theme="dark"] .step-card {
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.hero-copy { padding: var(--space-8); position: relative; overflow: hidden; }
.hero-copy::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--mobile-accent));
}

h1 { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: 800; line-height: 1.1; max-width: 12ch; letter-spacing: -0.03em; margin-bottom: var(--space-5); }
h2 { font-size: var(--text-xl); font-weight: 700; line-height: 1.2; letter-spacing: -0.02em; }
.sub { color: var(--color-text-muted); max-width: 60ch; }
.lede { max-width: 58ch; color: var(--color-text-muted); margin-bottom: var(--space-6); font-size: var(--text-lg); }

.cta-row { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-bottom: var(--space-6); }

.btn { 
  min-height: 48px; 
  padding: 0 var(--space-6); 
  border-radius: var(--radius-full); 
  display: inline-flex; 
  align-items: center; 
  justify-content: center; 
  gap: var(--space-2); 
  font-size: var(--text-sm); 
  font-weight: 700; 
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn:active { transform: scale(0.97); }

.btn-primary { 
  background: linear-gradient(135deg, var(--color-primary), var(--mobile-accent)); 
  color: #fff; 
  box-shadow: 0 4px 14px color-mix(in srgb, var(--color-primary) 40%, transparent); 
}
.btn-primary:hover:not(:disabled) { 
  box-shadow: 0 6px 20px color-mix(in srgb, var(--color-primary) 60%, transparent); 
  transform: translateY(-2px);
}
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-secondary { 
  background: var(--color-surface-offset); 
  color: var(--color-text);
  border: 1px solid var(--color-border); 
}
.btn-secondary:hover { background: var(--color-border); }

.btn-copy { 
  background: var(--mobile-accent-2); 
  color: var(--mobile-accent); 
  font-weight: 800; 
}
.btn-copy:hover { filter: brightness(1.05); }

.meta-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); margin-top: var(--space-6); }
.meta-chip { padding: var(--space-4); border-radius: var(--radius-lg); background: var(--color-surface-offset); border: 1px solid var(--color-border); text-align: center; }
.meta-chip strong { display: block; font-size: var(--text-lg); color: var(--color-primary); font-weight: 800; }
.meta-chip span { font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 600; }

.hero-side { padding: var(--space-6); }
.diagram { display: grid; gap: var(--space-4); margin-top: var(--space-5); }
.step-card { padding: var(--space-4); border-radius: var(--radius-lg); }
.step-num { display: inline-flex; width: 2.5rem; height: 2.5rem; border-radius: var(--radius-full); background: var(--color-primary-highlight); color: var(--color-primary); align-items: center; justify-content: center; font-weight: 800; font-size: var(--text-lg); margin-bottom: var(--space-3); }

main { display: grid; gap: var(--space-8); padding-bottom: var(--space-12); }
.panel { padding: var(--space-8); }
.section-head { display: flex; justify-content: space-between; gap: var(--space-4); align-items: end; margin-bottom: var(--space-6); }

.upload-box { 
  border: 2px dashed var(--color-primary); 
  background: color-mix(in srgb, var(--color-primary) 4%, var(--color-surface-2)); 
  border-radius: var(--radius-xl); 
  padding: var(--space-10) var(--space-6); 
  text-align: center; 
  position: relative; 
  overflow: hidden;
  transition: all 0.3s ease;
  cursor: pointer;
  display: block;
}
.upload-box:hover {
  background: color-mix(in srgb, var(--color-primary) 8%, var(--color-surface-2)); 
  border-color: var(--mobile-accent);
}
.upload-box input { display: none; }
.upload-icon { color: var(--color-primary); width: 64px; height: 64px; margin: 0 auto var(--space-4); opacity: 0.8; }

.uploader-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-3); margin-top: var(--space-5); }
.status { margin-top: var(--space-4); font-size: var(--text-sm); color: var(--color-text-muted); text-align: center; font-weight: 500; }

.results { display: grid; gap: var(--space-5); margin-top: var(--space-6); }
.result-card { padding: var(--space-5); border-left: 4px solid var(--color-primary); }
.result-top { display: flex; justify-content: space-between; gap: var(--space-4); align-items: start; margin-bottom: var(--space-4); }

.tag { display: inline-flex; align-items: center; padding: 0.4rem 0.8rem; border-radius: var(--radius-full); background: var(--color-primary-highlight); color: var(--color-primary); font-size: var(--text-xs); font-weight: 800; text-transform: uppercase; letter-spacing: 0.05em; }
.step-badge { display: inline-flex; align-items: center; padding: 0.4rem 0.8rem; border-radius: var(--radius-full); background: var(--mobile-accent-2); color: var(--mobile-accent); font-size: var(--text-xs); font-weight: 800; }

.kv { display: grid; grid-template-columns: 180px 1fr; gap: var(--space-3); font-size: var(--text-sm); padding-block: var(--space-2); border-top: 1px solid var(--color-divider); }
.kv:first-of-type { border-top: none; padding-top: 0; }
.kv strong { color: var(--color-text-muted); font-weight: 600; }
.mono { font-family: 'SFMono-Regular', Consolas, monospace; word-break: break-all; font-weight: 500; color: var(--color-text); }

.note { padding: var(--space-5); }
.note h2 { font-size: var(--text-lg); margin-bottom: var(--space-3); }
.note ul { padding-left: 1.5rem; color: var(--color-text-muted); }
.note li { margin-bottom: 0.5rem; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); }

.theme-toggle { width: 48px; height: 48px; border-radius: var(--radius-full); background: var(--color-surface-offset); color: var(--color-text); display: flex; align-items: center; justify-content: center; transition: all 0.2s; }
.theme-toggle:hover { background: var(--color-border); }

/* Auto Fetch Modal CSS */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.4); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); z-index: 1000; display: none; align-items: center; justify-content: center; padding: var(--space-4); opacity: 0; transition: opacity 0.3s ease; }
.modal-overlay.active { display: flex; opacity: 1; }
.modal-content { background: var(--color-surface-2); border-radius: var(--radius-xl); padding: var(--space-6); width: 100%; max-width: 420px; box-shadow: var(--shadow-lg); transform: translateY(20px); transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
.modal-overlay.active .modal-content { transform: translateY(0); }

.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-5); }
.modal-title { font-size: var(--text-lg); font-weight: 800; color: var(--color-text); }
.modal-close { width: 32px; height: 32px; border-radius: var(--radius-full); background: var(--color-surface-offset); display: flex; align-items: center; justify-content: center; font-size: 1.2rem; transition: background 0.2s; }
.modal-close:hover { background: var(--color-border); }

.form-input { width: 100%; padding: var(--space-3) var(--space-4); border: 2px solid var(--color-border); border-radius: var(--radius-md); font-size: var(--text-base); background: var(--color-surface); transition: border-color 0.2s; }
.form-input:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 4px var(--color-primary-highlight); }

.captcha-container { background: var(--color-surface-offset); border-radius: var(--radius-lg); padding: var(--space-4); margin-bottom: var(--space-5); min-height: 120px; display: flex; align-items: center; justify-content: center; border: 1px solid var(--color-border); }
.captcha-input { width: 100%; padding: var(--space-4); border: 2px solid var(--color-border); border-radius: var(--radius-lg); font-size: var(--text-xl); text-align: center; letter-spacing: 0.2em; font-weight: 800; margin-bottom: var(--space-5); text-transform: uppercase; background: var(--color-surface); transition: border-color 0.2s; }
.captcha-input:focus { border-color: var(--color-primary); outline: none; box-shadow: 0 0 0 4px var(--color-primary-highlight); }
.loader { border: 3px solid var(--color-border); border-top-color: var(--color-primary); border-radius: 50%; width: 32px; height: 32px; animation: spin 1s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite; }

@keyframes spin { to { transform: rotate(360deg); } }

/* Responsive adjustments */
@media (max-width: 1024px) {
  .hero { grid-template-columns: 1fr; gap: var(--space-6); }
  .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  body { font-size: 16px; }
  .shell { padding: var(--space-4); }
  .panel { padding: var(--space-5); }
  .upload-box { padding: var(--space-6) var(--space-4); }
  .kv { grid-template-columns: 1fr; gap: var(--space-1); }
  .kv strong { margin-bottom: 2px; display: block; }
  .cta-row, .uploader-actions, .result-top { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }
  .section-head { flex-direction: column; align-items: flex-start; gap: var(--space-3); }
  .theme-toggle-group { position: absolute; top: var(--space-4); right: var(--space-4); }
  .manual-code-row { flex-direction: column; }
}

@media (max-width: 480px) {
  h1 { font-size: 2rem; }
  .meta-grid { grid-template-columns: 1fr; gap: var(--space-3); }
  .brand svg { width: 36px; height: 36px; }
  .brand-name { font-size: 1.1rem; }
  .hero-card, .panel { padding: var(--space-4); }
  .upload-box { padding: var(--space-6) var(--space-3); }
  .upload-box div { font-size: 1.25rem !important; }
  .modal-content { padding: var(--space-4); border-radius: var(--radius-lg); }
  .captcha-input { font-size: 1.5rem; letter-spacing: 0.1em; padding: var(--space-3); }
  .captcha-container { min-height: 80px; padding: var(--space-2); }
  .btn { min-height: 44px; }
}

/* Tracker Styles */
.tracker-stats {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin: 0 auto var(--space-4);
  max-width: 800px;
  box-shadow: var(--shadow-sm);
}

.tracker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-3);
}

.tracker-item {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid var(--color-border);
}

.tracker-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tracker-values {
  display: flex;
  flex-wrap: wrap;
  width: 100%;
  justify-content: space-between;
  gap: 12px 4px;
}

.val-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 1 1 22%;
  min-width: 75px;
}

.val-col span {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  font-family: 'SFMono-Regular', Consolas, monospace;
}

.val-col small {
  font-size: 10px;
  color: var(--color-text-muted);
  margin-top: 2px;
}